Tire-casing-repair tool



H. J. OTTO.

'TIRE CASING BEPAIR'TOOL.

.APPLICATION man JuLY l. 1918.

1,380,008. Patented May 31, 1921'.

Elmf. i 1 A f Appliatiqn mea'xuly'i, 1918. seal No. 242,785.

afar-aria.,

HENRY J. ofr'ro,V or nvANsvILLn, INDIANA.

VTIRE--onsING-REM;In troon.v

To all whom it may cob/ccm iB e it known that L IIENRY J. Orro, a citizenof the United States, and a resident .of Evansville,in the countyV of Vanderburg Vvand State ofA Indiana, have invented certain new and'useful Improvements in Tire-Casing-Repair Tools, of which the following vis l "shoesit'is the common practice to out away the layers of the casing in stepped relation about the rupture,.then place inserts 1n the inwardlayer to the' one b"eing cut, such VV 11tti1f15 weakesthe @Sms Structures (and it i sianobject of this inventiontoprovide a teolfor'sutts away'the layers 0f a'gtre casing lwithatclean cut without inany way cuttingor mutilating the next inward layer, 'and'in a relatively 'short' time, the tool being provided with asubstantially oval runner or guard at the inner -edge of the blade, havling slight rises at its ends to prevent cutting or casting of the guards inthe inward vlayerofthe tire casing next to the one being cut.

vide a tool fas specified embodying a handle portion having abit carryingfhead removably mounted thereon'fwhich head adjusttably carries the bit ofthe tool to permit adjustment'of the bit at various angles and vpositions with respectto the handle, allowing the cutter .to work in close places such asnear the rim orl bead ofl'a tire casing, in-

side ast-iff Icasing Y*and lenable it to be adjusted for convenient` use in cutting various portions `of the exterior of the tire casing awkward and vconsequently slow the .llaves .elf the' er? are served @ed it Another object of the invention is to pro-Y is also an, object of this invention to provide Speeication ofLetters Patent. Patgntedma-y 31,.'1921, t

a cutting blade or bit forf a tool asspecified'V which will cut through lthe overlapping portions of both layers in a clean straight'line.

Other objects ofthe inventionfwill appear in the following detailed description, taken in connection with'the accompanying drawvv ing, and forming a part vof thi'srs'peciication, in which drawing: i Figure 'l is a side elevationfof the tire 4casing repair tool. Y

Fig. 2 is an'enlarged Fig.' 3 is an enlarged bottom plan ofthe v bit of the tool.

Fig. 4 is an enlarged'fragmentary section through the bit carrying head or' 'chuck of end View of the tool;

the tool showing-the bit indifferent post" tions with respect thereto one Vof which positions is shownin dotted lines.

Fig. 5 is anenlargeddetailperspective of the cutting bladeof the'bit structur'e.,` 5

im Casing 'shoving diffeieht posinns `tra@ tool with respect to the' Casin-g.

Fig. 7 isY affragmentary'perspective view of ay tire easing illustrating in dotand dash f linesl the manner of cutting'outor stepping' the layers ofthe `tire tofrepair a'ruptu're or blowout thereof.

Fig. Sis a fragmentary perspective view through a tireJ casing showingthe overlap-` ping of the meeting ends' 0f twovlayersl of the tire and also illustrating the manner in which-the blade of the to'olcuts therethrough.

Referring more particularly to the'drawing, l designates the VA handlaof the tool by the hand ofthe user of the tool and which hasa stem 2'coinected thereto in the usual manner by yInean'sofa ferrule 3.l The outerend ofthestem 2 is reduced indiam-v eter and threaded as shown' at" 4, extending into` the threaded boreI 5 of the chuck'or bit carrying' head r@which detachably connected to the stem 2 by they threadedengagement of the reduced end for thestem inthe gle to* the the head'or'vchuclneaus-z which is shapedto be conveniently gripped Y ing the bit 8 when connected to the head to extend at an acute angle to the stem 2, either inclining outwardly from the handle as shown in solid lines in Fig. 4 of the drawing or inwardly toward the handle as indicated in dotted lines in Fig. 4 of the drawing. These different positions of the tool permits its convenient manipulation in various positions about a tire, as will be mentioned in detail hereafter.

The upper end 9 of the bit 8 is circular in cross section and snugly fits within the opening 7. The inner end of the reduced threaded end 4: of the stem 2 engages against the end 9 of the bit 8, for binding the bit in adjusted positions with respect to the head G. rThe shank 10 of the bit 8 tapers as it extends outwardly from the circular portion9,'having its side edges converging,as clearly shown in Fig. 2 of the drawing. The cutting blade 11 is formed integrally with the shank 1Q. at the lower end of the same and its sides gradually converge as they extend downwardly from the upper end of the head as shown at 12 in Fig. 5, forming cutting edges 13. The edges of the blade 11 curve inwardly toward the longitudinal center of the blade as they extend downwardly and merge into the upper surface of the blunt base or runner 14 formed integrally upon the lower ends of the blade 11. The blunt base or runner 14 is substantially oval-shaped in plan, having its under surface rising at its ends, forming relatively sharp points at the end of the blunt base `or runner. The lower or underI surface of the blunt base or runner 14 is: conveXly curved, for rising over and preventing the gouging or hanging of the blade upon a layer of fabric of a tire casing which is inwardly of the layers being cut. 1f it is so desired, the cutting edges 18 of the blade 11 may be concavely curved as shown at 16, in Fig. 5 for presenting a concave-conveX cutting edge to the fabric of the tire casing.

Fig. 7 illustrates the manner of stepping or cutting away the layers of a tire indicated by the letter A, about a blow-out or rupture B thereof. The layers C and D are cut away in stepped relation, about the rupture B, as indicated in dot and dash lines to provide suitable openings for receiving inserts ,which are afterward vulcanized." through the tire for repairing the same.

In Fig. 6 of the drawing, theimprovedY tool is shown in various positions with respect to the tire, illustrating the convenience v .with which various portions of the tire that are normally diiicult to reach, may be cut with the tool. At a position E, the bit 8 of the tool is adjusted to incline `toward the handle 1 thereof, so as to permit convenient access to the interior of `a stii' casing or' shoe for cutting away portions of the inner layer thereof and at the position F, the bit 8 is adjusted to incline outwardly from the end of the head 6 and handle l, permitting the blade 11 to be positioned for cutting away portions of the casing A near the bead thereof and illustrating, the convenience with' which portions of layers of the tire casing may be cut away at this part of the tire.

Fig. 8 of the drawing, shows the common splice or overlapping of the meeting ends of layers Gr and H of a tire A, and also shows howV the cutting blade 11 will cut through the overlapping portions of the layers in a clean straight line cut.' There have been tools devised, for repairing tire casings, but one of the chief disadvantages of certain of said tools is that theV cutting blade is so short and thick that it will not cut through the overlapping ends of two layers of fabric of a tire casing at one stroke or cut and .where it engages the overlapping ends as shown in Fig. 8, it mutilates, by ragged cutting orgouging, either one or both of the overlapping ends, which undesirable features are overcome by the provision of the relatively long blade 11 and the particular construction lof its cutting edges as previously described.

lt will also be noted from the drawings and the above description that the cutting blade 11 may be adjusted to extend transversely or at right angles to the longitudinal aXis of the stem. 2, to cut the fabric laterally on the inside of a tire casing.

' rlhe cutting blade 11 .is formedy of tempered tool steel and the action of drawing it through the layers of the tire will whet or sharpen the blade, thereby rendering manually sharpening of the blade unnecessary.

Changes in details may be made without departing from the spirit of the invention, but:

I claim:

1. A tool for stepping tire casings in repairing blowouts, comprising a bit provided upon its end with a flat blade tapering in thickness outwardly from the bitand terminating at its outer edge portion in a knife edge, said Hat blade having upon its reduced end an enlarged shoe of greater length than the width of the blade and merging at opposite ends into the knife edges of the blade.

2. A tool for stepping tire casings in repairing blowouts, comprising a bit, a flat 'y blade carried on the end of the bit and tapering in thickness outwardly from the bit and toward the opposite edges of the blade to form cutting edges at the said edges of the blade, and a shoe arranged upon the outer end of the blade and being of greater width than said end of the blade and of greater length than the width of the blade, said shoe having a lower convexed face and is@ merging at opposite ends into the edge porrality of layers of the casing fabric, said tions of the blade. blade being provided with an enlarged shoe 3. A tool for stepping tire oasings in remember also having oppositely disposed cut- 10 pairing blovvouts, comprising a bit having ting edges and adapted to prevent said 5 near one extremity a flattened blade portion blade portion from severing more than. a provided with oppositely disposed cutting predetermined number of layers of fabric. edges adapted to simultaneously Sever a plu-y HENRY J. OTTO. 

